a(n) = phi(6^n+1), where phi is Euler's totient function (A000010).
A366630
a(n) = phi(6^n+1), where phi is Euler's totient function (A000010).
Terms
- a(0) =1a(1) =6a(2) =36a(3) =180a(4) =1296a(5) =6000a(6) =41472a(7) =230496a(8) =1580800a(9) =8359200a(10) =58579200a(11) =310968900a(12) =2175102720a(13) =10971642240a(14) =76065091200a(15) =351048600000
External references
- oeis: A366630